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A winter storm warning was issued for portions of Riverside and San Bernardino counties, where rain and snow are expected to affect driving conditions on freeways and mountain roads.

Snow levels will hover around 4,500 feet Friday morning before falling to about 3,000 feet later in the day. The heaviest snowfall – as much as 10 inches in the higher elevation coastal slopes – is expected during the day Friday.

Parts of Los Angeles County are under a winter weather advisory which began at midnight Friday and will last until noon Saturday, according to NWS.

Up to 8 inches of snow is expected to fall above 4,000 feet. And 4 inches or less is expected to coat mountain roads below 4,000 feet.

The storm could prompt the closures of Interstate 5 between Castaic and the Grapevine, and Highway 33 through the Ventura County Mountains, the weather service reported.
Wind advisories were also issued for several areas of Southern California.